Any activity that involves the wind, even spitting into the air, is the biblical prohibtion of zoreh. This is surprising, to the point that the Arukh ha-Shulkhan suggests that a scribal error changed zorek (throwing four amot in public) to zoreh. See Orah Hayyim 319:17:

Ashkenazic posekim still worry about the Yerushalmi. They express concerns about shaking out table cloths, using spray cans, blowing away dust, etc. But the Mishnah Berurah and Arukh ha-Shulhan both seem to dismiss these concerns altogether. Consult your local rabbi.